'Tis the season to do some shopping, and if you've added a new Macintosh to you shopping list, you've picked a great time to buy one. Apple's current lineup features a nice variety of Macs that offer great value.

But with all that Apple has to offer, it's understandable if it's unclear as to which Mac you should buy. MacBook or MacBook Pro? 21.5-inch iMac or 27-inch iMac? We've tested them all (well, almost all of them; we just got the new 27-inch 2.66GHz Core i5 iMac and we're testing it right now), and we're here to help.

It may not seem obvious when you look at the MacBook, but it has undergone a dramatic change. The new MacBook, released in October, still has a polycarbonate plastic like its predecessor released in June, but the new MacBook features a unibody design. The result is a MacBook body that's lighter, more durable and has fewer parts.

One drastic change with the MacBook is that it now has a non-removable battery. Apple says that a battery should last between 3.5 and 7 hours, depending on the type of tasks you're doing. Other improvements over its predecessor include a glass Multi-Touch trackpad with gesture support, and a LED backlit display.

The major missing feature in the MacBook is FireWire. The MacBook doesn't have either a FireWire 400 or FireWire 800 port. Connecting peripherals is done through one of the two USB 2.0 ports. The MacBook also doesn't have an IR port for the Apple Remote, but you can use an iPhone or iPod touch with a remote app over Wi-Fi.

Configurations: There's only one configuration of the MacBook available. For $999, you get a 2.26GHz Core 2 Duo processor, 2GB of DDR3 RAM, a 250GB hard drive, a 8X SuperDrive, and the Nvidia GeForce 9400M integrated graphics system, which uses 256MB of main memory for video.

Performance: The new MacBook provides a significant boost over its predecessor, thanks to the faster processor (2.26GHz in the new, 2.13GHz in the old) and a boost in RAM speed (100MHz in the new, 800MHz in the old). Compared to the 13-inch 2.26GHz Core 2 Duo MacBook Pro, the new MacBook was as fast or faster in many of our benchmark tests.

Macworld's buying advice: The MacBook is a very popular machine, offering a great combination of price and performance. The battery life was very good, and the new unibody design is a nice upgrade. The MacBook is a terrific machine for most people, but if you need FireWire in a laptop, you'll have to consider a MacBook Pro.

MacBook Pro

The unibody design may be new to the MacBook, but it's been over a year since the unibody MacBook Pros made its debut. The biggest change made to the MacBook Pro line back in June was the introduction of a 13-inch model to go along with the 15- and 17-inch laptops.

Besides adding the 13-inch model, Apple did add some new features during the June update. The 13- and 15-inch MacBook Pros now have SD card slots instead of ExpressCard/34 slots, while the 17-inch MacBook Pro has an ExpressCard/34 slot but no SD card slot. All of the MacBook Pros now have built-in batteries that are not user replaceable. And the 15-inch model has a new screen that's a big improvement over the screen in the previous 15-inch MacBook Pro. All of the MacBook Pros have FireWire 800.

Configurations: There are a total of six MacBook Pro standard configurations.

There are three 15-inch models. For $1699, you get a 2.53GHz Core 2 Duo processor, a 250GB hard drive, and Nvidia GeForce 9400M graphics. (Get best current price.) The next model up has a 2.66GHz Core 2 Duo processor, a 320GB hard drive, uses both the Nvidia GeForce 9400M and Nvidia GeForce 9600M GT (256MB dedicated video memory) for graphics, and costs $1999. (Get best current price.) The high-end 15-inch MacBook Pro has a 2.8GHz Core 2 Duo Processor, a 500GB hard drive, and the Nvidia GeForce 9400M and Nvidia GeForce 9600M GT (512MB dedicated video memory) for graphics, all for $2299. (Get best current price.) All of the 15-inch models have 4GB of RAM.

The 15- and 17-inch MacBook Pros are the only laptops in Apple's lineup that have antiglare screen options available but it'll cost and additional $50.

Performance: The 17-inch MacBook Pro was the fastest in our Speedmark 6 testing, but the 15-inch MacBook Pro with the same processor as the 17-inch model (a 2.8GHz Core 2 Duo) wasn't far behind. If you want the fastest MacBook Pro, you choice will be between these two models, and it basically comes down to whether or not you want the bigger screen

The $1199 13-inch MacBook Pro's performance was similar to the MacBook-in some tests, the MacBook was faster. When you're deciding between the MacBook and the 13-inch MacBook Pro, the decision comes down to FireWire, and to a lesser extent, your preference for plastic or aluminum.

Except for the screen size, the $1499 14-inch MacBook Pro has the same specifications as the $1699 15-inch MacBook Pro. As you might expect, the benchmark results from these to machines are nearly identical.

Macworld's buying advice: If you're on a budget and you don't need FireWire, the $99 MacBook is a better deal than the $1,199 13-inch MacBook Pro. The 13-inch 2.53GHz MacBook Pro, however, is a very good value--it has a smaller size and weight than the other MacBook Pros, and it actually offer performance that's similar to the $1699 15-inch 2.53GHz MacBook Pro. If you need the fastest MacBook Pro, either the 15- or 17-inch MacBook Pros with the 2.8GHz processor with fit the bill.

MacBook Air

Looking for a Mac netbook? The MacBook Air is the closest you'll get. The most recent MacBook Air models were released in June, and externally, the MacBook Air hasn't changed from the previous versions.

Not much has changed with the MacBook Air's internals, either--the most dramatic changes occurred between the first and second generations, and we're now at the third generation. About the only major change is with the processor.

Configurations: Before the June update there were two MacBook Air models. There are still two models, but the processors have been upgraded.

The first MacBook Air model is has a 1.86GHz Core 2 Duo processor, 2GB of RAM, and a 120GB hard drive for $1499. (Get best current price.) The other MacBook Air has a 2.13GHz Core 2 Duo processor, 2GB of RAM, and a 128GB solid-state drive for $1799. (Get best current price.)

Performance: In our testing, the 2.13GHz MacBook Air was a bit slower than the old top-of-the-line MacBook Air, which had a 1.86GHz Core 2 Duo. Even more interestingly, the new 1.86GHz MacBook Air was slower than the old 1.86GHz Core 2 Duo. We're note sure why each machine performed the way they did, but we suspect that the MacBook Air's thermal-protection systems in the new models turning down the speeds of the processors in order to keep the laptops cool.

Macworld's buying advice: The MacBook Air isn't about performance, and if speed in a small laptop is your top priority, you should consider a 13-inch 2.53GHz MacBook Pro. The MacBook Air is all about portability--it's small enough and light enough to bring with you almost anywhere.

Mac mini

Once considered the neglected machine in Apple's Macintosh line, the Mac mini has had two updates in one year (the most recent update occurring last October). Its specifications are fresh, making the smallest desktop Mac an attractive buy for switchers or current Mac owners looking for an affordable upgrade from a Power PC-based Mac.

Apple boosted the RAM in the $599 Mac mini from 1GB (which wasn't enough) to 2GB (a lot better). The $599 Mac mini also has 40GB more storage than before. The $799 Mac mini has 4GB of RAM, up from 2GB in the previous $799 model.

Apple also offers a new Mac mini with Snow Leopard Server, with a 2.53GHz Core 2 Duo processor and a pair of 500GB hard drives that you can configure as a RAID. This model doesn't have an optical drive.

Configurations: The $599 Mac mini has a 2.26GHz Core 2 Duo processor and a 160GB hard drive. (Get best current price.) The $799 Mac mini has a 2.53GHz Core 2 Duo processor and a 320GB hard drive. (Get best current price.)

You have to supply your own keyboard, mouse, and display. The Mac mini has both Mini DisplayPort and mini-DVI connectors, and Apple includes only a mini-DVI to DVI adapter.

Performance: The increase in processor speed and RAM helped the new Mac minis show decent increases over its predecessors. The difference between the old 2GHz Mac mini and the new 2.26GHz Mac mini was small, but much more noticeable between the old 2GHz Mac mini and the new 2.53GHz model.

Macworld's buying advice: The Mac mini is for the cost-conscious customer. You make some performance compromises, but this generation of the Mac mini has improvements that finally let the Mac mini take full advantage of Mac OS X and iLife '09. We think the $599 Mac mini is a better value than the $799 model

iMac

Apple's all-in-one computer was updated in October, and from the outside, the iMac changes look major. Instead of 20- and 24-inch models with 16:10 displays, the new iMacs have widescreen 16:9 displays at 21.5- and 27-inches. The image quality on the new iMacs is a big improvement over the previous iMacs, especially over the 20-inch iMac. Another new feature you'll notice: the SD card slot next to the SuperDrive slot.

A 3.06GHz Core 2 Duo processor can be found in three of the four new iMacs. With the 21.5-inch iMac, you can choose between a system that uses Nvidia's GeForce 9400M that uses 256MB of main memory for video, or a system with a ATI Radeon HD 4670 graphics card with 256MB of dedicated memory. There's a 27-inch 3.06GHz Core 2 Duo iMac with a 512MB Radeon HD 4670 graphics card, and another 27-inch iMac that uses a quad-core 2.66Ghz Intel i5 processor and an ATI Radeon HD 4850 graphics card with 512MB of video RAM.

Configurations: There are two 21.5-inch iMacs. The first 21.5-inch iMac has a 3.06GHz Core 2 Duo processor and a 500GB hard drive for $1199. (Get best current price.) The second 21.5-inch iMac also has a 3.06GHz Core 2 Duo processor, but with a 1TB hard drive for $1499. (Get best current price.)

There are two 27-inch iMacs. The 27-inch with a 3.06GHz Core 2 Duo processor has a 1TB hard drive and costs $1699. (Get best current price.) Then there a 27-inch iMac with a quad core 2.66GHz Intel i5 processor and a 1TB hard drive for $1999.

Performance:Our benchmarks showed that the three new iMacs with the 3.06GHz Core 2 Duo processors have the same speed as the old top-of-the-line 24-inch 3.06GHz Core 2 Duo iMac of the last generation. More significant gains can be seen with, say the old 20-inch 2.66GHz Core 2 Duo iMac and the new 3.06GHz iMacs.

With its quad-core processor, the 27-inch Intel i5 iMac could possibly show more significant gains over the previous generation of iMacs. This new 27-inch iMac just start shipping, and we're hoping to get one in our lab soon for benchmark testing.

Macworld's buying advice: The iMac has enough processing power for serious video and audio work, but are priced attractively for the general consumer. If you have an iMac from the previous generation, it might be compelling to upgrade if you have a model with a 2.66GHz Core 2 Duo processor, or you have the 20-inch iMac with the 6-bit display--the 21-inch display are a vast improvement. If you have a first-generation aluminum iMac or older, this is the time to upgrade, though you might wait for our review of the 27-inch quad core Intel i5 iMac.

Mac Pro

Apple's top-performing workstation was updated last March. Apple replaced the single-model Mac Pro with a pair of quad-core 2.8GHz Intel Xeon 5400 processors with a two of Mac Pro models, one with a single quad-core system 2.66GHz Intel Xeon 3500 processor, the other model running two quad-core Xeon 5500 processors at 2.26GHz.

The Mac Pros also have new graphics cards, Nvidia's GeForce GT 120 with 512MB of dedicated video RAM. The interior was redesigned to make it easier to access in the internals and to add or upgrade components.

Configurations: The first Mac Pro has a quad core 2.66GHz Intel Xeon 3500 processor, 3GB of RAM, and a 640GB hard drive for $2499. (Get best current price.)

The second Mac Pro has two quad core 2.26GHz Xeon 5500 processors, 6GB of RAM, and a 640GB hard drive for $3299.